Center hub for revolving chairs



R. K, DAWSON. CENTER HUB FOR REVOLVING CHAIRS.

APPLICATION FILED JAN. 28, I92I.

Patented May 31,1921.

INVENTOR- ROBERT K. DAWSDN 3 fnoisnnr KENNEDY nAwsoN, or GUELTH-O1STTAII oANiinA.

' CENTER. HUIBY Eon REVOLVING; (51m ns.

- a call whom a: m concern.-

- Be it known that I, ROBERT KENNEDY v DAwsoN, of the city of Guelph, in, the

county of Wellington, in the Province of "Ontario, Canada, have invented certain new ,and useful Improvements inGenter Hubs for Revolving Chairs, of which the following 'is a specification. I

' My 'invention'relates to lmprovements in center hubs for revolving chalrs and the object of the invention is to devise simplemeans for connecting the chair legs to the 7 center hub in such a way that the resistance to outward strain or tendencyto pull apart is provided just at the required polnt to counteract this tendency and it consists es sentially of anupper and lower plate, a tubular connector extending between the plates,

the lower plate being provided with radialarms, and lug projections extending upward from the lower plate in broad V-form pro viding interspacesdiverging outwardly toward the center of the'hub, and chalr legs provided with V dovetailed ends fitt1ng-be.- tween the upper and lower plates and having recesses in the lower portion thereof into which the side arms of the V-shaped lug projections fit and securing screws extending through the upper and lower plates into the chair legs as hereinafter more particularly described by the following specification.

Figure 1 is a perspective view of my center hub showing leg portions connected thereto.

Fig. 2 is a plan view, the right hand portion being on a plane coinciding with the upper edges of the chair legs and theleft hand portion on a plane coinciding with the upperedges of thelug projections of the lower center hub plate.

' F ig- 3' is a perspective detail of one of the V-shaped lug projections and a fragmentary portion ofthe lower center hub plate to which it is connected.

Fig. 4 is a fragmentary perspective detail of the portion of the chair leg adjacent'to the lower center hub plate showing the receiving recess for the lug projection shown in Fig. 3. V

Fig. 5 is a sectional detail showing the means for securing the tubular connector to the upper and lower center hub plates.

In the drawings like characters of refer-- ence indicate the corresponding parts in each figure.

1, 2, 3 and 4 are chair leg portions which Specification of Iietters Patented Application filed Ja ar' as, 1921-. a Serial No. 440,698

5 located 'at; each-sidefithereby forming a dove-tailed innerI.end In each side of Mayer, 1921.

radiate from the fcenter hereinafteridegti scrlbed. Each chair'leg portion-is provided at its inner end with a ratchet-shaped recess i each dove-tailed portion 6 and extending up:

wardly from its lower edge is located a recess 7 The centerhubcomprises an upper circular plate 8 providedwith orifices..9 through which screws '10 extend into thejleg' portions 1, 2', 3andv 4. A lower plate .11 is H provided wlth radiating arms 12which are I preferably provided with edge flanges 13. The plate'll is also provided with orifices 14, the edge of whichis turned upward as indicated at 15 which upturned edge is y forced into-the leg portions 1, 2, 3 and 4 bythe screws 16 as the plate 11 is drawn against the leg portion-by the screws; The orifices 9 of the plate 8 may be provided with similar turned portionswhich are forced by the screws 10 intothe upper edge of the leg portions l, 2, 3, or 4. 17 are- I rectangular orifices formed in the body of the platell. 18 arebroad V-shaped plate projections provided with lugs 19 which ex- I 1 tend through the orifices 17 being riveted or otherwise suitably secured-therein. The lug projections 18 aresecured to the lower center. hub plate 11 between each pair of the leg portions 1, 2, 3 and 4 so that each side arm of each V -lug projection fits into a recess 7 7 as clearly indicated in Fig. 2. a g

It will thus be seen that when the weight is brought to bear upon thelegs of the chair,

the tendency is for that portion ofthe chair leg in proximity to its upper edge to be v forced inward and that portion in proximity. portion of the chair leg to pull to the lower outward.

It will therefore be seen that nothing is required to counteract any outward pull'of that portion in proximity to the upper edge "which portion forms a fulcrum around which the chair leg tends to swingyertically. This tendency is counteracted, by the '1 I lug projections 18 fitting within the recesses 7. The lug projections forman inter-space w which is contracted toward its outer end so as to clearly'hold that portion ofthe leg fit-.

ting therebetween from pulling outward.-

21 are segmental spacing pieces which fit between the upper and lower plates 8 and 11 and in the recessed portion of the chair leg and also against the outer face of the lug projections 18. 22 is a tubular connection extending between the plates 8 and 11 and through orifices therein. (lhe upper end edge of the connector is rolled out over the edge of the orifice in the plate 8 and the lower end of the connector is reduced at 23 to fit the orifice 24 in the plate 11.

, It will thus be seen that I have provided a very simple strong and durable construction which is reinforced exactly at the point needed to prevent the legs of the chair and center hub breaking apart.

What I olaimas my invention is:

1. A center hub for revolving chairs, comprising an upper plate and a lower opposing plate suitably connected together, chair legs extending at-their inner ends between the opposing plates and-having recesses at the lower portion thereof and lug projections extending upwardly from the lower plate and fitting the recesses and adaptedto resist the tendency to outward pull of the chair leg when downward pressure is brought tobear upon the center hub.

2. A center hub for revolving chairs, comprising an upper and lower plate, chair legs the inner ends otwhich are provided with dove-tailed portions extending between the upper and lower plates and having recesses in the lower portion of each side, and lug projections of broad wt-shaped form secured to the lower plate between each pair of chair legs so that the arms of the V fit within the recesses of the opposing sides of each pair or" adj acent chair legs.

ROBERT KENNEDY DAWSON. 

